小城镇总体规划编制存在的问题及对策

城乡矛盾历来是我国经济发展的一对主要矛盾,如何协调两者的关系,缩小彼此之间的差距,是各学科长期致力于研究的热点问题。从规划层面而言,小城镇直接面对广大乡村地域空间,是协调城乡关系的最基层衔接点。其意义在于使小城镇总体规划编制的思路与时俱进,克服传统规划编制产生的弊端,使小城镇总体规划编制能够适应现代城乡规划的发展,消除城乡对立与差别,实现城乡相互融合。     

姬塬地区长６储层成岩相特征及测井响应

通过岩心观察并综合运用铸体薄片、扫描电镜、Ｘ射线衍射、物性以及压汞等基础测 试 资 料,对 姬 塬 地 区 长６致 密 砂 岩储层的岩石学、孔隙结构等特征展开了研究,系统分析了不同类型成岩相及其微观孔喉特征。依 据 储 层 物 性,结合主要的沉积特征、成岩矿物、填隙物及孔隙类型,研究区砂岩储层按照储集性能的好坏可划分为Ⅰ类（绿泥石膜 胶 结－残 余 粒 间 孔 相）、Ⅱ类（长石溶蚀相）、Ⅲ类（高岭石胶结相）、Ⅳ类（碳酸盐胶结相）４种成岩相带,其中Ⅰ类、Ⅱ类储层物性较好,是研究区储层发育的有利成岩相带,Ⅲ类、Ⅳ类则为较差储集岩相带。选取了自然伽马、声波时差、电阻率等对成岩相响应较为敏感的测井曲线,利用岩心、薄片资料刻度测井曲线,研究各成岩相在自然伽马、声波时差等测井曲线上响应特征的差异性。通过对成岩相分布特征及其测井响应特征进行研究,可以合理评价低渗透砂岩储层并预测优质储层发育带,同时为后续的油气地质勘探提供可靠的理论基础。      

基于真实砂岩微观水驱油实验的低渗透储层流体渗流特征及驱油效率影响因素研究:以姬塬油田王盘山长６储层为例

对鄂尔多斯盆地王盘山长６油层组低渗透储层的微观渗流特征及驱油效率影响因素进行了深入研究,室内模拟油田储层注水开发过程开展了真实砂岩微观模型水驱油渗流实验,结合薄片鉴定、物性分析、扫描电镜、恒速压汞等测试资料研究了储层微观水驱油特征,探讨了储层物性、微观孔隙结构、润湿性、驱替压力、注水倍数等参数与水驱油效率的关系.研究表明:王盘山区块长６储层微观渗流特征以均匀驱替、网状驱替为主,指状－网状驱替次之,少见指状驱替,在相同实验条件下不同驱替类型对应不同的驱油效率,均匀驱替类型驱油效率最高,平均值为６３．０８％,指状驱替类型驱油效率最低,平均值为２７．７２％;残余油８０％以簇状、膜状形式存在,角隅状、孤立状分布较少;储层物性中渗透率的变化对驱油效率的影响较大,孔隙度次之;注水倍数增大,驱油效率亦增大,注水倍数增大至３PV 时,驱油效率增大幅度减弱,趋于平缓、稳定;喉道半径＜０．４９μm 时,驱油效率呈指数倍数趋势增加,喉道半径＞０．４９μm 时,驱油效率呈线性倍数趋势增大.      

寒武纪生物大爆发之后的底栖生态系统工程建造者:以河南地区为例

扰动生物作为生态系统工程建造者,通过对沉积底质的改造直接影响沉积物和水体之间的相互作用(营养物质的循环、迁移和存储),对底栖生态系统工程有重要的影响.遗迹化石作为底栖生物活动的载体,为研究寒武纪大爆发之后底栖生态系统工程建造者的演化规律,并评价底栖生态系统工程建造者对生态系统工程产生的影响提供了依据.对河南地区8个寒武...     

Analytical investigations of seismic responses for reinforced concrete bridge columns subjected to strong near-fault ground motion

Strong near-fault ground motion, usually caused by the fault-rupture and characterized by a pulse-like velocity- wave form, often causes dramatic instantaneous seismic energy (Jadhav and Jangid 2006). Some reinforced concrete (RC) bridge columns, even those built according to ductile design principles, were damaged in the 1999 Chi-Chi earthquake. Thus, it is very important to evaluate the seismic response of a RC bridge column to improve its seismic design and prevent future damage. Nonlinear time history analysis using step-by-step integration is capable of tracing the dynamic response of a structure during the entire vibration period and is able to accommodate the pulsing wave form. However, the accuracy of the numerical results is very sensitive to the modeling of the nonlinear load-deformation relationship of the structural member. FEMA 273 and ATC-40 provide the modeling parameters for structural nonlinear analyses of RC beams and RC columns. They use three parameters to define the plastic rotation angles and a residual strength ratio to describe the nonlinear load- deformation relationship of an RC member. Structural nonlinear analyses are performed based on these parameters. This method provides a convenient way to obtain the nonlinear seismic responses of RC structures. However, the accuracy of the numerical solutions might be further improved. For this purpose, results from a previous study on modeling of the static pushover analyses for RC bridge columns (Sung et al. 2005) is adopted for the nonlinear time history analysis presented herein to evaluate the structural responses excited by a near-fault ground motion. To ensure the reliability of this approach, the numerical results were compared to experimental results. The results confirm that the proposed approach is valid.     

地震仪自控标定脉冲发生器

本文介绍了一种自控标定脉冲发生器的优点,即可以按照预置时间,同时实现多台地震仪的标定脉冲监视,进而取代目前模拟地震记录人工脉冲信号监视工作状态的常规工作。其标定时间统一、输入脉冲信号稳定。     

湖北地区历史有感地震震级测定方法的探讨

1.引言中国地震记载虽有数千年的历史,但无烈度和震级量度,仅有文字的直观叙述,如何根据历史记录资料来确定震级,以便进而研究地震分布及其活动规律,这是十分必要的基础工作。